Pillars of Solution for the Problem of Winter PM2.5 Variability in Fresno—Effects of Local Meteorology and Emissions

Pillars of Solution for the Problem of Winter PM2.5 Variability in Fresno—Effects of Local Meteorology and Emissions

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The mass composition of Particulate Matter (PM) with an aerodynamic diameter of 2.5 click here microns (PM_2.5) in San Joaquin Valley (SJV) is dominated by ammonium nitrate (NH₄NO₃), a secondary pollutant.The goal of this research was the investigation of the relationship between emissions, meteorology and PM_2.5 concentrations in Fresno for the winter season.

It was found that location of sites near emission sources such as freeways compared with residential sites strongly affected measured PM_2.5 concentrations.It was found that although long-term trends showed declines in both emissions and PM_2.5 concentrations, there was substantial variability between the years in the PM_2.5−emissions relationship.

Much of the yearly variation in the valhalla axys relationship between emissions and PM_2.5 concentrations can be attributed to yearly variations in weather, such as atmospheric stability, precipitation frequency and average wind speed.There are moderate correlations between PM_2.5 concentrations and temperature differences between nearby surface stations at varying elevations which explains some of the daily and seasonal variation in PM_2.5.

Occurrence of precipitation was related to low PM _2.5, although the higher wind speeds and lower atmospheric stability associated with precipitation likely explain some of the low PM_2.5 as well as washout of PM.